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<head>
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    <meta name="viewport" content="maximum-scale=1.0,minimum-scale=1.0,user-scalable=0,width=device-width,initial-scale=1.0" />
    <title>title</title>
    <link rel="stylesheet" type="text/css" href="../css/api.css" />
    <style>
        body {
            padding-top: 1.5rem;
        }

        .header {
            width: 93%;
            height: 3rem;
            padding: 0.5rem 0.8rem;
            border-bottom: 1px solid rgb(242, 242, 242, 0.5);
            line-height: 3rem;
            position: fixed;
            top:2rem;
            background-color: #fff;
        }

        .header ul {
            width: 80%;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
        }

        .header ul li {
            width: 30%;
            text-align: center;
            float: left;
        }

        .header ul li a {
            color: black;
            text-decoration: none;
            font-weight: bold;
        }

        #a {
            color: #40cccc;
        }
        .lines_s {
            position: absolute;
            top:3.7rem;
            left: 74%;
            border-bottom: 0.25rem solid #40cccc;
            width: 2rem;
        }
        .nav{
          width: 94%;
          padding: 1rem 0.8rem;
          display: flex;
          justify-content: space-between;
          flex-wrap: wrap;
          margin-top: 3rem;
        }
        .nav_one{
          width: 48%;
          margin-top: 1rem;
          height: 13.5rem;
          border: 1px solid rgb(242, 242, 242, 0.5);
          box-shadow: 0 5px 10px rgb(223, 223, 223);

        }
        .one_img{
          width: 100%;
          height: 6.5rem;
          border: none;
        }
        .one_img img{
          width: 100%;
          height: 100%;
        }
    </style>
</head>

<body>
    <div class="header">
        <ul>
            <li><a href="#">我的大学</a></li>
            <li><a href="#">同学们</a></li>
            <li><a href="#" id="a">专家讲座</a>
              <div class="lines_s"></div>
            </li>

        </ul>
    </div>
    <div class="nav">
      <div class="nav_one">
        <div class="one_img">
          <img src="../image/u23.png" alt="">
        </div>
        <h5 style="margin-top:0.5rem;padding-left:0.3rem">别让你的疏忽，成为孩子受伤的源头</h5>
        <p style="color:#ccc;font-size:0.8rem;margin-top:0.5rem">儿童安全第一人赵博士手把手教您，全方位守护孩子</p>
        <p style="color:red;font-size:1.2rem;margin-top:0.5rem;float:right">￥68</p>
      </div>
      <div class="nav_one">
        <div class="one_img">
          <img src="../image/u23.png" alt="">
        </div>
        <h5 style="margin-top:0.5rem;padding-left:0.3rem">别让你的疏忽，成为孩子受伤的源头</h5>
        <p style="color:#ccc;font-size:0.8rem;margin-top:0.5rem">儿童安全第一人赵博士手把手教您，全方位守护孩子</p>
        <p style="color:red;font-size:1.2rem;margin-top:0.5rem;float:right">￥68</p>
      </div>
      <div class="nav_one">
        <div class="one_img">
          <img src="../image/u23.png" alt="">
        </div>
        <h5 style="margin-top:0.5rem;padding-left:0.3rem">别让你的疏忽，成为孩子受伤的源头</h5>
        <p style="color:#ccc;font-size:0.8rem;margin-top:0.5rem">儿童安全第一人赵博士手把手教您，全方位守护孩子</p>
        <p style="color:red;font-size:1.2rem;margin-top:0.5rem;float:right">￥68</p>
      </div>
      <div class="nav_one">
        <div class="one_img">
          <img src="../image/u23.png" alt="">
        </div>
        <h5 style="margin-top:0.5rem;padding-left:0.3rem">别让你的疏忽，成为孩子受伤的源头</h5>
        <p style="color:#ccc;font-size:0.8rem;margin-top:0.5rem">儿童安全第一人赵博士手把手教您，全方位守护孩子</p>
        <p style="color:red;font-size:1.2rem;margin-top:0.5rem;float:right">￥68</p>
      </div>
      <div class="nav_one">
        <div class="one_img">
          <img src="../image/u23.png" alt="">
        </div>
        <h5 style="margin-top:0.5rem;padding-left:0.3rem">别让你的疏忽，成为孩子受伤的源头</h5>
        <p style="color:#ccc;font-size:0.8rem;margin-top:0.5rem">儿童安全第一人赵博士手把手教您，全方位守护孩子</p>
        <p style="color:red;font-size:1.2rem;margin-top:0.5rem;float:right">￥68</p>
      </div>
      <div class="nav_one">
        <div class="one_img">
          <img src="../image/u23.png" alt="">
        </div>
        <h5 style="margin-top:0.5rem;padding-left:0.3rem">别让你的疏忽，成为孩子受伤的源头</h5>
        <p style="color:#ccc;font-size:0.8rem;margin-top:0.5rem">儿童安全第一人赵博士手把手教您，全方位守护孩子</p>
        <p style="color:red;font-size:1.2rem;margin-top:0.5rem;float:right">￥68</p>
      </div>
    </div>
</body>
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